This isn't about fearmongering, it is about consistent application of the principle. If the legal principle of privacy and autonomy doesn't apply in Roe, then its reasonable to conclude that it doesn't apply for marriage equality either.
The question is, is it reasonable that we should allow one's right to privacy and autonomy to only exist in some states? And if so, then this principle could apply to more than just abortion. Yes, reimplementing a ban on interracial marriage in any state seems completely unreasonable now, but so did banning abortion a decade ago. Things change. A senator just recently stated that anti-interracial marriage laws should not have been struck down by the courts [1]
Interracial marriage is brought up for multiple reasons:
- To demonstrate that the roll-back of constitutionally protected rights to individual privacy and autonomy have negative unintended consequences
- To demonstrate that some who are opposed to constitutionally-protected privacy apply the principle inconsistently (usually contingent on whether it meshes with their personal/religious views)
- To demonstrate that those who do support this rollback consistently are willing to let gay and interracial couples be collateral damage in the pursuit of their ideological goals
[1] https://slate.com/news-and-politics/2022/03/republican-sen-m...